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CHICAGO — Authorities are investigating after police say two young girls were shot, one fatally, on Chicago’s Northwest Side.

Chicago police confirm that a 7-year-old girl was killed and a 6-year-old girl was wounded in the Sunday shooting.

WGN has learned that the two girls are sisters and were visiting relatives in Belmont Central before the shooting.

The incident occurred around 2:50 p.m. in the area of 6200 block of W. Grand Avenue. Authorities say the young shooting victims were inside a vehicle when gunfire erupted. During a press conference Sunday, Chief of Patrol Brian McDermott said police believe the shooting victims were not the intended target.

According to police, the young victims’ mother was placing them in the back seat of the vehicle when shots rang.

Responding officers rendered first aid until ambulances rushed both girls to Loyola Hospital for medical treatment. McDermott said the 6-year-old remains hospitalized and is “fighting for her life.”

Police would not say if the gunfire was the result of a drive-by shooting. Area Five detectives are investigating. No shooter is in custody at this time.

McDermott urged anyone with information to leave an anonymous tip at A $2,000 reward is being offered for information leading to an arrest.

“Too many young people have lost their lives to the senseless gun violence here in the city of Chicago,” McDermott said. “We owe it to the families to bring these violent offenders who have no respect for human life to justice.”

WATCH: CPD provides update after sisters shot, one killed, on Northwest Side